| Sample | a (in Å) | c (in ´10−2 nm) | Volume of unit cell (in ´10−3 nm3) |
| As-prepared | 44.58 | 59.03 | 101.602 |
| Ann. at 373 K | 44.52 | 59.65 | 102.405 |
| Ann. at 423 K | 44.53 | 59.49 | 102.140 |